SULCOREBUTIA
Sulcorebutia albissima
Sulcorebutia brevispina
Sulcorebutia flavissima
Sulcorebutia kruegerii
Sulco-Rebutia langerii - small cactus, less that an inch across, but producing beautiful flowers. Below is an older specimen which has multiple offsets.
Sulcorebutia sub la villa
Sulcorebutia vazqueziana
Sulcorebutia zavaletae